51
Immergas
Modulation Control Fault
Display shows 51, boiler may not reach set temperature, poor modulation
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Faulty gas valve modulating coil, Broken modulation wiring, PCB modulation output failure
How to Fix / Troubleshooting
Safety: Gas valve work is for qualified technicians only.
Steps:
- 1. Observe flame: A technician can observe flame size while changing setpoint. If flame does not change, modulation is not working.
- 2. Check wiring: Inspect the modulation coil connector and cable for damage.
- 3. Measure coil resistance and control signal: Replace gas valve or PCB as indicated.
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Repair Difficulty
Professional Required
5/5
Required Part
Modulating Gas Valve
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